蓝桥杯 Java 外卖店优先级

思路：
硬模拟，注意不要用for循环时间从1到T，会TLE。
AC代码：

import java.util.*;
public class Main {
    static Map> map = new HashMap<>();
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        int T = sc.nextInt();
        for(int i = 0; i < m; i ++ ) {
            int a = sc.nextInt();
            int id = sc.nextInt();
            if(!map.containsKey(id)) 
                map.put(id, new ArrayList<>());
            map.get(id).add(a);
        }
        
        int res = 0;
        for(Integer id : map.keySet()) {
            List cur = map.get(id);
            cur.add(0);
            Collections.sort(cur);
            int len = cur.size();
            int value = 0;
            boolean is = false;
            for(int i = 1; i < len; i ++ ) {
                int nap = Math.max(0, cur.get(i) - cur.get(i - 1) - 1);
                value = Math.max(0, value - nap);
                if(is && value <= 3) is = false;
                value += 2;
                if(value > 5) is = true;
            }
            if(is) {
                int nap = T - cur.get(len - 1);
                if(value - nap > 3) res ++ ;
            }
        }
        System.out.println(res);
    }
}